An obd2 code reader, or scan tool, is a handheld device that connects to your vehicle’s onboard diagnostics system (known as OBDII, or second-generation onboard diagnostics). It monitors sensor values and when something goes wrong, the modules generate fault codes that trigger a warning light such as the check engine indicator. A scanner can read those error codes and explain, and can also clear the code and turn off the indicator light if you have fixed the issue.

Whether you’re looking to do a DIY inspection or simply want a quick and inexpensive way to troubleshoot your car, a scan tool is a must-have. There are several types of obd2 code reader available, ranging from the basic to the more advanced. The lowest-priced models read error codes and are very easy to use. The more expensive ones are more advanced and may be used as a diagnostic tool to determine the root cause of a specific problem.

Cracking the Code: How OBD2 Code Readers Simplify Vehicle Troubleshooting

The first step is to locate your vehicle’s OBD-II port, which is a female 16-pin connector shaped like a trapezoid. This port is typically located under the steering wheel but can be in other places, such as in the center console or the dash. Plug your scanner in and turn on the car, but don’t start the engine. Most scanners will power up automatically when they connect to the OBD-II port.

Some scanners will ask you to enter your vehicle’s identification number, while others will require you to select the make and model of your car. Once the scanning process is complete, the scanner will display a list of codes and their description. Some scanners will even give you live data, such as the engine RPM and coolant temperature.